Aqua Lung i750TC Owner's manual

Dive Computer Owner's Manual

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i750TC

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NOTICES

LIMITED TWO-YEAR WARRANTY

For warranty details and to register your product, refer to www.aqualung.com.

COPYRIGHT NOTICE

This owner's manual is copyrighted, all rights are reserved. It may not, in whole or in part, be copied, photocopied, reproduced, translated, or

transferred to any other form without prior consent in writing from Aqua Lung.

i750TC Dive Computer Owner's Manual, Doc. No. 12-7852

Vista, CA USA 92081

TRADEMARK, TRADE NAME, AND SERVICE MARK NOTICE

Aqua Lung, the Aqua Lung logo, i750TC, the i750TC logo, Gas Time Remaining (GTR), Diver Replaceable Batteries, Graphic Diver Interface,

Pre-Dive Planning Sequence (PDPS), SmartGlo, Set Point, Control Console, Turn Gas Alarm, and Aqua Lung computer Interface (ALI) are all

registered and unregistered trade-marks, trade names, and service marks of Aqua Lung. All rights are reserved.

PATENT NOTICE

U.S. Patents have been issued to protect the following design features: Dive Computer with Free Dive Mode and/or Wireless Data Transmis-

sion (U.S. Patent no. 7,797,124), GTR/Air Time Remaining (U.S. Patent no. 4,586,136 and 6,543,444) and Data Sensing and Processing

Device (U.S. Patent no. 4,882,678). Set N2 Bar Graph Alarm (NIBG Alarm) and other patents pending. User Setable Display (U.S. Patent no.

5,845,235) is owned by Suunto Oy (Finland).

DECOMPRESSION MODEL

The program within the i750TC simulates the absorption of inert gases into the body by using a mathematical model. This model is merely

a way to apply a limited set of data to a large range of experiences. The i750TC dive computer model is based upon the latest research and

experiments in decompression theory. Still, using the i750TC, just as using any other No Decompression Tables, is no guarantee of avoiding

decompression sickness, i.e. “the bends”. Every diver’s physiology is different, and can even vary from day to day. No machine can predict

how your body will react to a particular dive prole.

DANGERS, WARNINGS, CAUTIONS, AND NOTES

Pay attention to the following symbols when they appear throughout this document. They denote important information and tips.

! DANGERS: are indicators of important information that if ignored would lead to severe injury or death.

! WARNINGS: are indicators of important information that if ignored could lead to severe injury or death.

! CAUTIONS: indicate information that will help you avoid faulty assembly, leading to an unsafe condition.

NOTES: indicate tips and advice that can inform of features, aid assembly, or prevent damage to the product.

RESPONSIBLE COMPUTER DIVING

• Always plan each dive.

• Always limit your dive to the level of your training and experience.

• Always make your deepest dive rst.

• Always make the deepest part of every dive rst.

• Check your computer often during the dive.

• Do a safety stop on every dive.

• Allow adequate surface interval between each dive.

• Allow adequate surface interval between each day of diving (12 Hours or until your computer clears).

• Read and understand this manual thoroughly before using the i750TC.

Responsible

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!

WARNINGS:

• The i750TC is intended for use by recreational divers who have successfully completed a

internationally recognized course in scuba diving (for air use) and diving with enriched nitrogen-

oxygen (nitrox) breathing gas mixtures (for nitrox use).

• It must not be used by untrained persons who may not have knowledge of the potential risks and

hazards of scuba diving and diving with enriched nitrogen-oxygen (nitrox) mixtures.

• You must obtain scuba certication in diving with enriched nitrogen-oxygen mixtures (nitrox) before

using the i750TC for nitrox diving.

• It is NOT for use by military and commercial divers.

• As with all underwater life support equipment, improper use or misuse of this product can cause

serious injury or death.

• Never participate in sharing or swapping of a dive computer.

• Conduct your dives in such a manner so as to insure that you continuously check the computer's

proper function.

• Read and understand this owner’s manual completely before diving with the i750TC.

• If you do not fully understand how to use this dive computer or if you have any questions, you should

seek instruction in its use from your authorized Aqua Lung dealer before you utilize this product.

• If your i750TC stops working for any reason while operating, it is important that you have anticipated

this possibility and are prepared for it. This is an important reason for not pushing the tables, oxygen

exposure limits, or entering decompression without proper training. If you dive in situations where

your trip would be ruined or your safety would be jeopardized by losing the use of your i750TC, a

backup instrument system is highly recommended.

• Each numeric and graphic display represents a unique piece of information. It is imperative that you

understand the formats, ranges, and values of the information represented to avoid any possible

misunderstanding that could result in error.

• Remember that technology is no substitute for common sense. The dive computer only provides

the person using it with data, not the knowledge to use it. Remember also that the dive computer

does not actually measure and test the composition of your body tissue and blood. Using an Aqua

Lung dive computer, just as using any other Decompression Tables, is no guarantee of avoiding

decompression sickness. Every diver’s physiology is different and can even vary from day to day. No

machine can predict how your body will react to a particular dive prole.

• Diving at high altitude requires special knowledge of the variations imposed upon divers, their

activities, and their equipment by the decrease in atmospheric pressures. Aqua Lung recommends

completion of a specialized altitude training course by a recognized training agency prior to diving in

high altitude lakes or rivers.

• Repetitive dives in a series should only be conducted at the same altitude as that of the rst dive of

that series. Repetitive dives made at a different altitude will result in an error equal to the difference in

barometric pressure, and possibly a false dive mode with erroneous data.

• If the i750TC is activated at an elevation higher than 4,270 m (14,000 ft), it will immediately shutdown.

• Decompression diving or diving deeper than 39 m (130 ft) will greatly increase your risk of

decompression sickness. This should only be attempted by those properly trained and certied

in decompression diving. It is important to completely understand the features, functions, and

specically the limitations of the i750TC. Based on this the diver must decide if the i750TC is suitable

for the dive activities and dive proles being planned.

• Using an i750TC is no guarantee of avoiding decompression sickness.

• The i750TC enters Violation Mode when a situation exceeds its capacity to predict an ascent

procedure. These dives represent gross excursions into decompression that are beyond the

boundaries and spirit of the i750TC's design. If you are following these dive proles, Aqua Lung

advises that you should not use an i750TC.

• If you exceed certain limits, the i750TC will not be able to help you get safely back to the surface.

These situations exceed tested limits and can result in loss of some functions for 24 hours after the

dive in which a violation occurred.

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CONTENTS

NOTICES 2

RESPONSIBLE COMPUTER DIVING 2

WARNINGS: 3

GETTING STARTED 6

BASICS 7

INITIAL ACTIVATION 7

DISPLAY ICONS 8

BUTTONS 9

BUTTON FUNCTIONS 10

HOME MENU 11

HOME MENU 12

ADJUST BRIGHTNESS 12

MY INFO 13

MODE MENU 13

LOG 13

SETUP MENU 14

1. SET AUTO DIM 15

2. SET DATE, TIME 15

3. BLUETOOTH 16

HISTORY 16

DC (DIVE COMPUTER) INFO 17

DIVE FEATURES 18

DTR (DIVE TIME REMAINING) 19

NO DECOMPRESSION 19

O2 MIN (OXYGEN TIME REMAINING) 19

BAR GRAPHS 20

ASC BAR GRAPH 20

N2 BAR GRAPH 20

ALGORITHM 20

CONSERVATIVE FACTOR 20

DS (DEEP STOP) 20

SS (SAFETY STOP) 21

LOW BATTERY WHILE ON THE SURFACE 21

LOW BATTERY DURING A DIVE 22

AUDIBLE ALARM 22

PROXIMITY OF THE TRANSMITTERS & i750TC 23

DIVE SURFACE MODE 25

ON THE SURFACE BEFORE A DIVE 26

ALT 1 (LAST DIVE) 26

ALT 2 27

ALT 3 27

ALT 4 27

DIVE MENU 28

PLAN 28

SET GAS 29

TRANSMITTERS 30

SET ALARMS 31

SET UTILITIES 33

1. H2O TYPE (Water Type) 33

2. UNITS 33

3. DEEP STOP 33

4. SAFE STOP (SAFETY STOP) 34

5. CF (Conservative Factor) 34

6. SAMPLING (SAMPLE RATE) 34

DIVE OPERATION 35

INITIATING A DIVE 36

NO DECOMPRESSION DIVE MAIN 36

DIVE ALT 1 37

DIVE ALT 2 37

DEEP STOP PREVIEW 37

EARMARK 37

DEEP STOP MAIN 38

SAFETY STOP MAIN 38

SURFACING 38

GAS/TRANSMITTER SWITCHES 39

OVERVIEW 39

COMPLICATIONS 41

DECOMPRESSION 41

DECOMPRESSION ENTRY 41

DECOMPRESSION STOP MAIN 41

CONDITIONAL VIOLATION (CV) 42

DELAYED VIOLATION 1 (DV 1) 42

DELAYED VIOLATION 2 (DV 2) 43

DELAYED VIOLATION 3 (DV 3) 43

VIOLATION GAUGE MODE DURING A DIVE 43

VIOLATION GAUGE MODE ON THE SURFACE 44

HIGH PO2 44

Warning 44

Alarm 44

PO2 During Decompression 45

HIGH O2 SAT (OXYGEN SATURATION) 45

Warning 45

Alarm 45

Warning During Decompression 46

Alarm During Deco 46

Alarm On Surface 46

GAUGE MODE 47

ON THE SURFACE BEFORE A DIVE 48

GAUGE SURF MAIN MENU 49

INITIATING A DIVE 50

GAUGE DIVE MAIN 50

GAUGE DIVE ALT 51

RUN TIMER 51

DELAYED VIOLATION 3 (DV3) 51

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FREE MODE 52

FREE DIVE MODE DETAILS 53

ON THE SURFACE BEFORE A DIVE 54

FREE SURF MAIN MENU 55

CDT (COUNTDOWN TIMER) SETUP 55

SET MENU 56

1. H2O TYPE (Water Type) 56

2. UNITS 56

3. RTI AL (Repeating Time Interval Alarm) 56

4. DEPTH AL (Alarm) 57

INITIATING A DIVE 57

FREE DIVE MAIN 58

FREE DIVE ALT 58

HIGH NITROGEN ALARM 58

COMPASS MODE 59

COMPASS DISPLAY ICONS 60

OVERVIEW 61

COMPASS MAIN MENU 62

COMPASS MAIN 62

CALIBRATE 62

SET DECLINATION 64

SET HEADING 64

TIMEOUT 65

EARMARK 65

ALARMS 66

ASC (Ascent) Alarm 66

Depth Alarm 66

REFERENCE 67

UPLOADING/DOWNLOADING 68

CARE AND CLEANING 68

SERVICE 68

BATTERY REPLACEMENT 69

TECHNICAL DATA 72

NO DECOMPRESSION TIME LIMITS 73

OXYGEN EXPOSURE LIMITS 74

ALTITUDE LEVELS 74

SPECIFICATIONS 75

ABBREVIATIONS/TERMS 78

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GETTING STARTED

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GETTING STARTED

BASICS

Welcome to your new i750TC. The i750TC is an easy to use dive computer utilizing a three button interface.

Divers may choose between three modes of functionality consisting of Dive, Gauge, and Free Mode. Though the

i750TC is easy to use, you will get the most out of your new i750TC if you take some time to familiarize yourself

with its displays and operation. Information has been organized into easy to follow sections to aid you in learning

all you need to know. There is also a glossary at the end of this guide for any terms that may sound unfamiliar.

INITIAL ACTIVATION

To activate the i750TC, press and release any button. The i750TC will also turn on if its metal contacts become

wet and you descend below 1.5 m (5 ft) for 5 seconds.

• Upon activation, the unit will display the Welcome screen and perform a diagnostic check. The i750TC checks

the display and voltage at this time to ensure that everything is within tolerance.

• It will also check ambient barometric pressure, and calibrate present depth as 0 m (ft). When at 916 m (3001 ft),

or higher, it will adjust for the higher altitude.

• After the Diagnostic check, the i750TC will display the Home Menu (or Dive Main if wet activation).

NOTE: The i750TC has no off button or command. If no buttons are pressed or dives made, the unit

will enter sleep mode after 2 minutes. Within 2 hours of no buttons being pressed or dives made, the

unit will shut itself off. However, the i750TC will stay on for a 24 hour period after a dive, counting

down FLY (time to y) and DESAT (desaturation time) if a dive has been made.

WELCOME SCREEN HOME MENU SCREEN

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GETTING STARTED

SYMBOL MEANING

or DEPTH (METERS OR FEET)

NO DECOMPRESSION TIME (DIVE TIME REMAINING)

O2 SATURATION TIME (DIVE TIME REMAINING)

TIME TO SURFACE

DIVE TIME

GAS/TRANSMITTER # (1, 2, OR 3)

GAS TIME REMAINING

or VALUE IS GAS PRESSURE IN BAR OR PSI

DEEP STOP (TRIGGERED)

or GAS MIX (AIR OR 21 - 100%)

BATTERY CONDITION IS GOOD (SURFACE ONLY)

LOW BATTERY WARNING

LOW BATTERY ALARM

SURFACE TIME

COUNTDOWN TIMER (FREE MODE)

RUN TIMER (GAUGE MODE)

or MAXIMUM DEPTH (METERS OR FEET)

DISPLAY ICONS

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GETTING STARTED

BUTTONS

The i750TC utilizes 3 control buttons called the MODE, ADV (Advance), and SELECT buttons. They allow you to

select mode options and access specic information. They are also used to enter settings and acknowledge the

audible alarm.

Pressing different combinations of these buttons will navigate through different menus and options of the i750TC.

The symbols in the table below will illustrate how to proceed through the menus.

SYMBOL MEANING

PRESS BUTTON LESS THAN 2 SECONDS

HOLD BUTTON GREATER THAN 2 SECONDS

SELECT

ADVMODE

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GETTING STARTED

BUTTON FUNCTIONS

ACTION BUTTON FUNCTION

SELECT

ADVMODE

MODE

• to access main menus from main screens

• to step up the screen, backward through selections

• to toggle or change setpoints

• to apply Earmark

SELECT

ADVMODE

SELECT

• to select, save an option or setting

• to start/stop Run Timer (Gauge mode) and Countdown

Timer (Free mode)

SELECT

ADVMODE

ADV

• to access Alt screens

• to step down the screen, advance through selections

• to toggle or change setpoints

SELECT

ADVMODE

MODE

• to exit a menu directly to the Main screen

• to access Home Menu from Main screens

SELECT

ADVMODE

SELECT

• to switch between Compass mode and the active diving

mode, while on the Main screen

• to exit or step back to the previous screen or setting

SELECT

ADVMODE

ADV

• to increase a setting value at a faster rate

• to access Adjust Brightness screen

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HOME MENU

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HOME MENU

This is a base menu that provides access to general items common to all the operating dive modes. When the

i750TC is activated manually, this is the rst screen you will see after the Welcome screen.

SELECT

ADVMODE

ADJUST BRIGHTNESS

The level (%) of screen brightness can be adjusted to optimize screen appearance in different lighting conditions

or to conserve battery power. Press the Select button to cause the percentage value to ash and allow it to be

changed.

NOTE: During a Low Battery Warning or Alarm condition, the level will be limited to 60% maximum.

to select

an option

to scroll

up

to scroll

down

to access

Adjust Brightness

screen

SELECT

ADVMODE

to access,

save setting

to increase

value

to decrease

value

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HOME MENU

MY INFO

This screen displays up to 7 lines of personal information containing up to 16 characters each. Information must

be entered using the PC/Mac/Diverlog interface. The screen shown below will be displayed until information has

been uploaded.

SELECT

ADVMODE

to exit

MODE MENU

This screen allows you to access the DIVE, GAUGE, or FREE modes.

SELECT

ADVMODE

to select

menu option

to scroll

up

to scroll

down

LOG

The log stores Information from DIVE and/or GAUGE mode dives for viewing.

• If no dives are recorded, the message NONE YET will be displayed.

• There is a maximum of 24 entries overall.

• After exceeding 24 entries the oldest entries will be deleted to allow space for the new entries.

• Dives are numbered starting with 1 each time DIVE (or GAUG) mode is activated. After 24 hours elapse with no

dive, the rst dive of the next period of operation is called Dive #1.

• I n the event that dive time (DIVE-T) exceeds 999 min, the data at the 999 interval is recorded in the Log upon

surfacing of the unit.

NOTE: New data will automatically overwrite the oldest data in memory when the memory becomes

full. If you do not remember to log or download your dives, they will be lost when the memory over-

writes. See the PC Download section of this manual for instructions on downloading dives.

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HOME MENU

SELECT

ADVMODE

to select

menu option

to scroll

up

to scroll

down

NO DIVES FULL LOG (99 Entries)

entry number

date

dive number

SELECT

ADVMODE

to Log Data 2

SELECT

ADVMODE

to exit

LOG DATA 1 LOG DATA 2

Dive Type: no deco, deco,

viola (violation), gauge

Elevation:

SEA (or EL2 - EL7)

surface

interval

dive

time

start & end pressure

of tank #1

FO2 , PO2 setting of the gas

used at the end of the dive

(DIVE Mode only)

maximum PO2

(DIVE Mode only)

O2 Saturation

(DIVE Mode only)

SETUP MENU

This screen allows you to adjust the Auto Dim, Set Date Time, and Bluetooth® features.

SELECT

ADVMODE

to select

menu option

to scroll

up

to scroll

down

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HOME MENU

to increase

value

to decrease

value

1. SET AUTO DIM

While underwater the i750TC screen dims after a set time interval from the last button press. This

is done to reduce distractions during the dive and to conserve power. The i750TC allows you to

customize the time interval and degree of dimming. This feature may also be turned off.

SELECT

ADVMODE

to save

setting

OFF or 0:20 - 2:00

10 - 60%

to increase

value

to decrease

value

2. SET DATE, TIME

Within this menu you can set the formats, date, and time of day.

SELECT

ADVMODE

to save

setting

12 or 24 hr

Month.Day

or Day.Month

set date

set time

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HOME MENU

to toggle

setting

to toggle

setting

3. BLUETOOTH

Within this screen the Bluetooth® may be turned on or off. When Bluetooth® is turned on it will

operate in snifng mode (searching for compatible devices) while on the surface. Comunication

with your i750TC must be initiated with your traditional computer or mobile device using Diverlog

software.

NOTE: When Bluetooth® is ON the Bluetooth® icon will display on the DIVE, GAUGE, or

FREE Main screens. Bluetooth® is temporarily deactivated when a dive is started and re-

turns to snifng mode when the i750TC enters Surface Mode.

SELECT

ADVMODE

to save

setting

HISTORY

History is a summary of basic data recorded during all DIVE and GAUGE dives.

NOTE: Dives made in Free mode are not shown in History or the Log mode. Free dive data is only vis-

ible using the PC Download software.

SELECT

ADVMODE

return to menu

0 - 9999

highest altitude

recorded for a

dive

lowest recorded

water temperature

deepest recorded

dive

longest dive time

0 - 999 min

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HOME MENU

DC (DIVE COMPUTER) INFO

Information displayed on the DC Info screen should be recorded and kept with your sales receipt. It will be

required in the event that your i750TC requires factory service.

SELECT

ADVMODE

return to menu

date of last

factory calibration

rmware revision

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DIVE FEATURES

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DIVE FEATURES

DTR (DIVE TIME REMAINING)

The i750TC constantly monitors No Decompression status and O2 Accumulation, and will display whichever time

is the least amount available as DTR on the No Decompression Dive Main screen. The time being displayed will

be identied by the NO DECO (no decompression) or O2 MIN icons.

NO DECOMPRESSION

No Decompression is the maximum amount of time that you can stay at your present depth before entering de-

compression. It is calculated based on the amount of nitrogen absorbed by hypothetical tissue compartments. The

rates each of these compartments absorb and release nitrogen is mathematically modeled and compared against

a maximum allowable nitrogen level.

Whichever compartment is closest to this maximum level is the controlling compartment for that depth. Its result-

ing value NO DECO (no decompression) will be displayed. It will also be displayed graphically as the N2 Bar

Graph, see Bar Graphs later in this section.

As you ascend, the N2 Bar Graph will recede as control shifts to slower compartments. This is a feature of the

decompression model that is the basis for multilevel diving, one of the most important advantages that Aqua Lung

dive computers offer.

O2 MIN (OXYGEN TIME REMAINING)

When set for nitrox operation, O2 SAT (Oxygen Saturation) during a dive is displayed on an ALT screen as a

percentage of allowed saturation identied by the O2 SAT graphic. The limit for O2 SAT (100%) is set at 300 OTU

(Oxygen Tolerance Units) per dive or 24 hour period. See the chart at the back of this manual for specic times

and allowances. O2 SAT and O2 MIN values are inversely related; as the O2 SAT value increases the O2 MIN

value decreases.

When the O2 MIN value becomes less than the No Decompression calculations for the dive, DTR (Dive Time

Remaining) will be controlled by O2 SAT and the O2 MIN value will be displayed as the DTR on the Dive Main

screen, identied by the O2 MIN icon.

DTR is

No Decompression

DIVE ALT 4

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DIVE FEATURES

BAR GRAPHS

The i750TC features two specic bar graphs.

1. The one on the left represents ascent rate. It is referred to as ASC Bar Graph.

2. The one on the right represents nitrogen loading. It is referred to as the N2 Bar Graph.

Nitrogen Loading

Ascent Rate

ASC BAR GRAPH

The ASC Bar Graph provides a visual representation of ascent speed (i.e., an ascent speedometer). When the

ascent is faster than the recommended 30 fpm (9 mpm), all segments ash until the ascent is slowed.

# OF SEGMENTS ASCENT RATE,

FPM (MPM)

0 0 - 1 (0 - 0.3)

1 >1 - 5 (0.3 – 1.5)

2 >5 - 10 (>1.5 - 3.0)

3 >10 - 15 (>3.0 - 4.6)

4 >15 - 20 (>4.6 - 6.1)

5 >20 - 25 (>6.1 - 7.6)

6 >25 - 30 (>7.6 - 9.1)

7 >30 (>9.1)

N2 BAR GRAPH

The N2 Bar Graph represents your relative No Decompression or Decompression status. As your depth and

elapsed dive time increase, the bar graph will grow in length, shift from green to amber, and ultimately to red (in-

dicating a Decompression condition). As you ascend the bar graph recedes, indicating that additional No Decom-

pression time is available. The i750TC monitors multiple theoretical nitrogen compartments simultaneously. The

N2 Bar Graph displays the one that is in control of your dive at any given time.

ALGORITHM

The i750TC utilizes the Z+ algorithm to calculate nitrogen tissue loading. Performance is based on Bühlmann

ZHL-16C algorithm model. To create even greater margins of safety with respect to decompression, a Conserva-

tive Factor as well as No Decompression Deep and Safety Stops can be included for No Decompression dives.

CONSERVATIVE FACTOR

When the CF is set On, the dive time remaining, No Decompression/O2 MIN, which are based on the algorithm

and used for N2/O2 calculations and displays relating to Plan Mode, will be reduced to the values available at the

altitude level that is 915 m (3,000 ft) higher than the actual altitude at activation. Refer to the charts in the back of

this manual for dive times.

DS (DEEP STOP)

When the DS selection is set ON, it will trigger after descending deeper than 24 m (80 ft. The i750TC then calcu-

lates (continually updating) a Stop Depth equal to ½ the Max Depth.

NOTE: The Deep Stop feature only works in DIVE mode while within No Decompression times.

ASC ALARM TRIGGERED

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Aqua Lung i750TC Owner's manual

Aqua Lung i750TC Owner's manual

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